I just made an extension function to replace it locally ```i

Question

I just made an extension function to replace it locally ```inline fun lt reified A reified B gt Either lt Throwable A gt product f gt Either lt Throwable B gt Either lt Throwable Tuple2 lt A B gt gt return this flatMap a gt f map b gt a toT b ```

raulraja · Answer

is this coming from an imported extension

Satyam Agarwal · Answer

you mean the error then yes the `mproduct` is imported from `arrow core extensions either monad mproduct`

Satyam Agarwal · Answer

```implementation io arrow kt arrow core data $arrowKtVersion implementation io arrow kt arrow core $arrowKtVersion implementation io arrow kt arrow fx coroutines $arrowKtVersion implementation io arrow kt arrow fx kotlinx coroutines $arrowKtVersion implementation io arrow kt arrow fx $arrowKtVersion ``` are dependencies I am pulling atm

Satyam Agarwal · Answer

i will remove `arrow fx` and `arrow fx kotlinx coroutines` once I have removed IO completely from project

raulraja · Answer

We are debating if those methods are useful since in suspension we have not found a use case for it that can t be done in place with easier syntax Do you have a small example on how you are using mproduct I d like to explore and see if that and others are worth keeping around for 1 0

Satyam Agarwal · Answer

this is a pattern I do for all my ktor routers ```ParametersValidator validateId id toEither mproduct tokenValidator validateRequest authorization ```

Satyam Agarwal · Answer

and then I use the destructured tuple as input to the service layer

Satyam Agarwal · Answer

Also `Either fx ` is deprecated yet it is used the migration readme and arrow website ``` Deprecated Fx blocks are now named based on each datatype please use `either ` instead replaceWith = ReplaceWith either eager lt L R gt c fun lt L R gt Either Companion fx c suspend MonadSyntax lt EitherPartialOf lt L gt gt gt R Either lt L R gt = Either monad lt L gt fx monad c fix ```` alternative given in `either eager` which gives compilation error ```Restricted suspending functions can only invoke member or extension suspending functions on their restricted coroutine scope```

Satyam Agarwal · Answer

tried just `either ` as well thats same too

Satyam Agarwal · Answer

I understand `Either fx` is much better but I don t know why I just love chaining methods using extra syntax like map flatmap mproducts sweat smile